[regexp] Remove unused code

src/arm64/interface-descriptors-arm64.cc

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/arm64/interface-descriptors-arm64.h"
 
 #if V8_TARGET_ARCH_ARM64
 
 #include "src/interface-descriptors.h"
 
@@ skipping 208 matching lines @@
 void ConstructTrampolineDescriptor::InitializePlatformSpecific(
     CallInterfaceDescriptorData* data) {
   // x3: new target
   // x1: target
   // x0: number of arguments
   Register registers[] = {x1, x3, x0};
   data->InitializePlatformSpecific(arraysize(registers), registers);
 }
 
 
-void RegExpConstructResultDescriptor::InitializePlatformSpecific(
-    CallInterfaceDescriptorData* data) {
-  // x2: length
-  // x1: index (of last match)
-  // x0: string
-  Register registers[] = {x2, x1, x0};
-  data->InitializePlatformSpecific(arraysize(registers), registers);
-}
-
-
 void TransitionElementsKindDescriptor::InitializePlatformSpecific(
     CallInterfaceDescriptorData* data) {
   // x0: value (js_array)
   // x1: to_map
   Register registers[] = {x0, x1};
   data->InitializePlatformSpecific(arraysize(registers), registers);
 }
 
 
 void AllocateHeapNumberDescriptor::InitializePlatformSpecific(
@@ skipping 223 matching lines @@
       x1,  // the JSGeneratorObject to resume
       x2   // the resume mode (tagged)
   };
   data->InitializePlatformSpecific(arraysize(registers), registers);
 }
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_TARGET_ARCH_ARM64